Electric furnace.



PATENTED OCT. 2, 1906.

E. A. STOREY. ELECTRIC FURNACE. urmcuxox HLED 311F113, 1905.

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i ELECTRIC FURNACE. APPLICATION FILED BEPT. 13, 1905.

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Q/vi l'ncoaea No- 832,511. PATENTED 0012,1906.

E. A. STOREY.

ELECTRIC FURNACE.

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witness l 1 N lTED STATES EDWIN A. STOREY, OF NEYVARK, NElV JERSEY.

ELECTRIC FURNACE.

Specification of Letters Patent.

Patented Oct. 2, 1906.

Application filed September 13, 1905. Serial No. 278,356.

To all whom it may concern:

Be it known that I, EDWIN A. STOREY, a citizen of the United States,residing at Newark, in the county of Essex and State of New Jersey, haveinvented new and useful Improvements in Electric Furnaces, of which thefollowing is a specification.

The invention relates to an improvement in electric furnaces designedprimarily for fus- 1O ing refractory substances, such as vitrifyingenamel or like products of various articles.

The main ob ect of the present invention is the production of a furnacein which the resistance-conductors are connected within the furnace by aslab or case of resisting material of a articular nature.

A rther object of the invention is the production of a furnaceconstructed in sections and having portions arranged for convenient 2oremoval, whereby to permit ready access to the interior of the furnace.

The present invention will be described in detail in the followingspecification, reference bein had to the accompanying drawings, in

Whic Figure 1 is a view in elevation of a furnace constructed inaccordance with myinvention. Fig. 2 is a transverse section through thefur nace pro er. Fig. 3 is a side elevation of the same; i 4 is alongitudinal section on the line 4 4 of ig. 2. Fig.v 5 is a plan view ofthe furnace, and Fig. 6 is a sectional view on the line 6 6 of Fig. 4.

In the use of the ordinary furnace for vit- 3 5 rifying the enamelingmaterial serious objection has been encountered in that the le th oftime re uired to effect the result in sue a furnace l, in addition tovitri 'ng said material, highl heat the material 0 the 40 article beingename ed, and owing to the difference in coefficients of expansion ofthe enamel and article will tend to crack or crease the enamel incooling. Furthermore, it has been found very difficult in the usualfurnace to accurately control the degree of heat or to maintainuniformity therein when once secured.

With the object of avoiding these defects in the ordinai y constructionmy furnace comprises a furnace proper consisting in a base 1 andvertically-pro ecting walls 2, supported on said base and spaced apartto provide the interior dimension of furnace required. The upper part ortop of the furnac 5 5 is made in a single section comprising a to; plate3 and depending walls 4 to rest squar-iy 'ment transverse the furnace.

upon the upper ends of the walls 2. By this arran ement the cover of thefurnace may be move when desired to permit change in the interior of thefurnace.

The structure so far described is composed of any desirable refractorymaterial, the Walls of the opening within the furnace being preferablylined with a suitable non-conducting material 5, as asbestos. Thefurnace proper is opened at front and rear, the former opening beingprovided with the asbestos-lined closing-door 6, having the usualmica-covered inspection-opening 7, while the rear furnaceopeningcommunicates directly with what I term a tunnel or he t-air chamber,which extends at right ang es to the length of the fur nace and will bemore specifically described hereinafter. The base 1 of the furnace iscen trally and lon itudinally recessed for the reception of thefeed-screw 8, having an operating wheel or handle 9 located beyond thefurnace and mounted at its rear end in a suitable bearing provided atthe end of the recess. Tracks 10 are supported on the furnace-bottom oneither side of the plane of the feedscrew, being adapted to movablysupport a truck 11, from which de ends an arm 12, extending to andhaving t eaded e agement with the feed-screw, whereby revo ution of saidscrew will move the truck longitudinally of the tracksthat is,lengthwise of thefurnace.

The heating agent of my improved furnace is the electrical current, andits utilizationin the interior of the furnace is gained through apluralit of carbon or like conductors mounttieal wall of the furnace,similar carbons 14 also arranged in pairs being mounted for lonitudinalmovement in suitable o enings formed in the opposite vertical Wal of thefurnace, the arrangement being such that the terminals of said carbonsare in direct aline- By preference the o enings in which the carbons 13and 14 are s idably mounted are formed as recesses 15 in the upper endsof the vertical walls 2,

the recesses eing practically coextensive in pth with the thickness ofthe carbons, so that when the cover-section of the furnace is in placethe lower ends of the walls 4 close the mouths of said recesses andthereb provide the walled openings for the reception of the carbons.Each pair of carbons 13and 14 are connected by a bonding-conductor 16,which is connected directly to a source of electricity.

As the heating medium Within the furnace I arrange a slab or casing 17of a peculiar nature, such as thoria, magnesia, or kaolin,

I which when cold is substantially non-conducnace these carbons areconnected with a source of electricity through a bonding-clamp 20encircling both carbons and connected to the generator by suitableconnections. The

carbons I8 are of a length to project through the cover s'ection's ofthe furnace and rest upon the resistor therein when desired, thoughit-is to be understood that the o ening within which said carbons arearrange is of such nature as to permit vertical and horizontaladfustment of the respective psi-rs of carbons to adjust the degree 0heat as desired. It is to be understood that the strips-13 and 14,totogether with the resistor, constitute oneconductor, the strips 18constitute the other conductor. The resistor is so positioned within thefurnace as to be supported immediately above the plane of the movementof the. truck, so that 21 or other articles to be vitrified will on aproper adjnstment of the truck be positioned immediately beneathandslightly spaced from-said resistor. The tunnel or hot-air chamber,which extends at right angles to the length of the furnace and is inopen communication at one end with the rear wall of the furnace, is alsoformedirr sections, comprising a bottom or base 22, side walls2%,resting upon said base, and a top-wall or cover 24, resting'looselyon the upper ends of the vertical walls.

is construction provides for the ready asee'ss to the hot-air chamberwhen desired and use of my improved furnace will be fully obvious fromthe above description, taken in connection with the drawings, it beingnoted that the interior of the furnace is readily accessible throu h itssectional construction.

. The passage 0 the current through the carbon-conductors of theresistor described will induce ,a great degree of heat within thefurnace, which, operating upon the enameling carried by the articles,will flash or uickly fuse said ename'ling without materia ly increasingthe heat of the article.

Having thus described the invention, what is claimed as new is- 1. Anelectric furnace comprising a furnace proper, horizontally-arrangedconductors extending through opposite walls of the furnace, a resistorsupported by the inner ends of said conductors, and a conductor supported by the furnace and movable in a plane at right air has to theplane of thefirst-mentioned con uctorsf 2. An electric furnacecomprising a furnace proper, hori-zontallyarranged conductors extendingthrough opposite wallscf the furnace, a resistor supported by the innerof said conductors, and conductors vertically movable in the furnace andarranged to contact with said resistor.

3. An electric furnace comprising a furnace proper,horizontally-arranged conductors extending through opposite walls of thefurnace, a resistor supported by the inner ends of said conductors, andconductors vertically movable in the furnace and arranged to contactwith said resistor, all of said con ducto-rs being freely movable intoand out of operative osition.

' 4. An eectric furnace comprising a furnace proper,horizontally-arranged conductors extending through opposite walls of thefurnace, a resistor supported by the inner ends of said conductors,conductors vertically movable in the furnace and arranged to contactwith said resistor, tracks supported within the furnace, a truck movableon said tracks, and means for feeding the truck lengthwise of thefurnace.

5. In a dielectric'furnace duplicate conductors extending through thewalls of the furnac'e, a resistor supported by said conductors, and anadditionalconductor adapted to contact withsaid resistor.

In testimony whereof I affix my signature in presence of two witnesses.

EDWIN A. STOREY.

Witnesses:

M. K. WILLOUGHBY, WILLIAM F. Bormnna.

IIO

